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Recipe Templates

Template recipes are provided for most common data processing tasks, including analyses of calibration data and science data. In many cases, to reduce your data you just need to select the relevant FITS files and choose which template recipe should be applied (or, for common tasks, the Data Parser may automatically select the right template for you).

For convenience, template recipes are divided into several different reduction types:

These different types simply provide a convenient way of restricting which subset of templates are displayed on screen to choose from, based on the recipes that are most likely to be of use for the data at hand. [1] Also, when editing a given recipe, the list of available primitives is optionally filtered to only display primitives appropriate for the current type of recipe. This is mostly just a convenience to keep spectral and polarimetry primitives from cluttering the interface unnecessarily when not in use.

Some recipes are designed to start from raw data files and produce datacubes from each raw file and/or combined results from an entire sequence. Other recipes are designed to start from already-existing datacubes and just do the sequence combination. In general we recommend first creating datacubes only, and not trying to combine sequences right away. Once you have datacubes you are satisfied with then you can do the sequence combination using the recipes that start from datacubes. The problems of creating datacubes and combining sequences for PSF subtraction are mostly separable, so it makes sense to consider each step one at a time and iterate on them separately.

Spectral Science Mode Template Recipes

Here are the available recipe templates for spectral mode reductions. This list intentionally includes a wide range of options, and some recipes are more recommended than others. These are indicated below.

Template Name Expected Input Purpose
Quicklook Automatic Datacube Extraction Raw files Used for real-time reductions while observing, to produce decent quality “quick look” datacubes without doing the full calibration process.
Create Clean 2D Detector Image Raw files Cleans up detector artifacts (dark subtraction, bad pixel repair, etc) but stops before making a datacube. Outputs a 2D image.
Simple Datacube Extraction Raw files Create a basic datacube with the minimal amount of processing. This is a good starting point for making your own first datacubes before adding additional calibration steps. Recommended
Calibrated Datacube Extraction   Aimed at performing a better reduction including more rejection of detector artifacts, flux-calibration based on satellite spots, and updates to world coordinates information. Recommended
Contrast Measurement Raw files Used to obtain a contrast measurement and evaluate AO performance. This same calculation can also be performed using GPItv
Simple Extraction, ADI+SSDI reduction Raw files Performs simple reduction and an ADI+SSDI reduction.
Simple Extraction, ADI+LOCI reduction Raw files Performs simple reduction and an ADI+LOCI reduction.
Rotate and combine extended object   For a simple extraction and ADI reduction of extended objects
KLIP ADI reduction (From Reduced Cubes) Raw files Starting from a series of already-reduced datacubes, combine the sequence using ADI and the KLIP algorithm (Soummer et al. 2012). This is a good choice for PSF subtraction since the KLIP algorithm is relatively fast. Recommended
Contrast measurement (From Raw Data) Raw files Create datacubes and then use the satellite spots to measure the contrast. The contrast profile will be saved to a file.
‘Contrast measurement (From Reduced Cubes)’ Datacubes From a series of already-reduced datacubes, use the satellite spots to measure the contrast. The contrast profile will be saved to a file.
Basic ADI + Simple SDI reduction (From Raw Data) Raw files Make datacubes and then combine them using ADI and SDI for PSF subtraction. This is not a recommended recipe for the reasons noted above, that it’s better to break up reduction into smaller chunks, but this recipe still exists for historical reasons.
Basic ADI + Simple SDI reduction (From Reduced Cubes) Datacubes From already-reduced cubes, perform PSF subtraction using basic ADI and simple SDI. This is an OK recipe, but the Basic ADI algorithm does not perform as well as LOCI or KLIP.
LOCI ADI reduction (From Raw Data) Raw files Starting from raw files, create datacubes and perform PSF subtraction using LOCI (Lafreniere et al. 2007)
LOCI ADI reduction (From Reduced Cubes) Datacubes Starting from already-reduced datacubes, perform PSF subtraction using LOCI (Lafreniere et al. 2007) Recommended
Create datacubes, Rotate, and Combine unocculted sequence Raw files Starting from raw data, create datacubes, and then rotate, align, and sum them without doing any PSF subtraction. This is intended for observations of unocculted targets, for instance solar system objects. Recommended
KLIP SDI (From Raw Data) Raw files Starting from raw data

Polarimetry Science Mode Template Recipes

Template Name Expected Input Purpose
Quicklook Automatic Polarimetry Extraction Raw files For real-time reductions while operating the instrument. It produces decent quality datacubes without doing the full calibration process.
Simple Polarization Datacube Extraction Raw files Performs the extraction of a polarization difference cube including dark subtraction, flexure correction, noise reduction and bad pixel correction. Recommended
Basic Polarization Sequence (From Raw Data) Raw files Performs a basic reduction to generate a Stokes datacube. This includes all the steps in the Simple Polarization Datacube Extraction, plus the least squares Mueller matrix construction of the final Datacubes.
Basic Polarization Sequence (From podc cubes) Datacubes Creates a Stokes Datacube from already reduced difference cubes. The data is rotated North up and several additional noise reduction techniques are performed. Recommended

Calibration Data Template Recipes

Calibration Recipes are discussed in more detail in the Step-by-Step guide to processing data sections.

Template Name Expected Input Purpose
Dark    
Create Thermal/Sky Background Cubes Raw files Create background datacubes for subtraction from science data. This is most relevanta for K band
Combine Thermal/Sky Background Images    
Generate Cold Bad Pixel Map from Flats    
Generate Hot Bad Pixel Map from Darks    
Combine Bad Pixel Maps    
Find satellite locations    
Lenslet scale and orientation    
Flat-field Extraction    
Wavelength Solution    
Wavelength Solution 2D    
Quick Wavelength Solution    
Create Polarized Flat-field    
Calibrate Polarization Spots Locations    
Calibrate Polarization Spots Locations - Parallel    

Software Testing Template Recipes

This is a section for template recipes that are used in testing and debugging the pipeline itself. There are several recipes of this type. Don’t try to use these for science reductions directly.

Footnotes

[1]But that said, there is nothing stopping you from choosing to apply a Calibration type template to your science data, or vice versa, if for some reason you wish to do so.